Plan your next outdoor adventure with the help of MapSource™ United States TOPO CD-ROM. This CD contains digital topographic maps for the U.S., including Alaska and Hawaii that are comparable to the U.S. Geological Survey 1:100,000-scale paper maps.

I use a Garmin 60CS which has a built-in base map like many Garmin models. This topo software allows you to download topos onto your compatible Garmin unit that can be viewed directly on the unit's screen. You can plan routes and waypoints on your PC, then download it to your unit along with the topo of the area. The scale is 1/100 and is not the quality of a USGS 1/100, but it is better than others I've seen and you can zoom in to 300 ft. It works best when used in tandem with a 1/24 quad. It shows major contour lines, land/water features, mountains, mines, etc. Depending on the memory capacity of your unit, you can download a fairly large area, usually larger than you can hike in a week.